An investigation of pulsatile flow in a model cavo-pulmonary vascular system

The complexities in the flow pattern in a cavo‐pulmonary vascular system—after application of the Fontan procedure in the vicinity of the superior vena cava, inferior vena cava, and the confluence at the T‐junction—are analysed. A characteristic‐based split (CBS) finite element scheme involving the...

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Vydáno v:Communications in numerical methods in engineering Ročník 25; číslo 11; s. 1061 - 1083
Hlavní autoři: Chitra, K., Vengadesan, S., Sundararajan, T., Nithiarasu, P.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Chichester, UK John Wiley & Sons, Ltd 01.11.2009
Wiley
Témata:
Biological and medical sciences
blood flow
CFD
Computational techniques
Exact sciences and technology
finite element method
flow visualization
Fluid dynamics
Fontan procedure
Fundamental and applied biological sciences. Psychology
Fundamental areas of phenomenology (including applications)
General theory
Hemodynamics. Rheology
inferior vena cava
Mathematical methods in physics
Physics
superior vena cava
total cavo-pulmonary connection
Vertebrates: cardiovascular system
CFD
Compressibility
Scale models
Steady flow
Transient flow
Finite element method
Energy dissipation
Scaling laws
Qualitative chemical analysis
Modelling
Quantitative chemical analysis
Method of characteristics
Energy analysis
Fontan procedure
Computational fluid dynamics
Fractional step method
Experimental study
Long term
Blood flow
total cavo-pulmonary connection
inferior vena cava
Blood circulation
Pulsatile flow
Flow visualization
Energy losses
superior vena cava
Circulatory system
Man
ISSN:1069-8299, 1099-0887
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Shrnutí:The complexities in the flow pattern in a cavo‐pulmonary vascular system—after application of the Fontan procedure in the vicinity of the superior vena cava, inferior vena cava, and the confluence at the T‐junction—are analysed. A characteristic‐based split (CBS) finite element scheme involving the artificial compressibility approach is employed to compute the resulting flow. Benchmarking of the CBS scheme is carried out using standard problems and with the flow features observed in an experimental model with the help of a dye visualization technique in model scale. The transient flow variations in a total cavo‐pulmonary connection (TCPC) under pulsatile conditions are investigated and compared with flow visualization studies. In addition to such qualitative flow investigations, quantitative analysis of energy loss and haemodynamic stresses have also been performed. The comparisons show good agreement between the numerical and experimental flow patterns. The numerically predicted shear stress values indicate that the pulsatile flow condition is likely to be more severe than steady flow, with regard to the long‐term health of the surgically corrected TCPC. Copyright © 2008 John Wiley & Sons, Ltd.
Bibliografie:istex:4B304C6A9AFDFBFDE5160B37991858B08060B34A
ArticleID:CNM1205
EPSRC - No. D070554
ark:/67375/WNG-X7S335GV-R
ISSN:1069-8299
1099-0887
DOI:10.1002/cnm.1205